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STM8S データシート(PDF) 184 Page - STMicroelectronics

部品番号 STM8S
部品情報  STM8S Series and STM8AF Series 8-bit microcontrollers
PDF  467 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM8S データシート(HTML) 184 Page - STMicroelectronics

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16-bit advanced control timer (TIM1)
RM0016
184/467
DocID14587 Rev 14
17.5.9
Clearing the OCiREF signal on an external event
The OCiREF signal of a given channel can be cleared when a high level is detected on
ETRF (if OCiCE =1 in the TIM1_CCMRi registers, one enable bit per channel). The OCiREF
signal remains low until the next UEV occurs. This function can be used in output compare
mode and PWM mode only. It does not work in forced mode.
The OCiREF signal can be connected to the output of a comparator and be used for current
handling by configuring the external trigger as follows:
1.
Switch off the external trigger prescaler by setting bits ETPS[1:0] in the TIM1_ETR
register to 00.
2.
Disable external clock mode 2 by setting the ECE bit in the TIM1_ETR register to 0
3.
Configure the external trigger polarity (ETP) and the external trigger filter (ETF) as
desired.
Refer to Figure 47: External trigger input block diagram.
Figure 79 shows the behavior of the OCiREF signal when the ETRF input becomes high, for
both values of the enable bits OCiCE. In this example, the timer is programmed in PWM
mode.
Figure 79. ETR activation



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